Process for producing surface-postcrosslinked water-absorbent polymer particles
US-10208170-B2 · Feb 19, 2019 · US
Heat exchanger for heating gas and use of the heat exchanger
US11933552B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11933552-B2 |
| Application number | US-202217688032-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 7, 2022 |
| Priority date | Dec 23, 2015 |
| Publication date | Mar 19, 2024 |
| Grant date | Mar 19, 2024 |
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- Title
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- Abstract
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Abstract
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The invention relates to a heat exchanger for heating gas to a temperature in the range from 150 to 400° C., wherein the gas is heated by indirect heat transfer and all the surfaces of the walls of the heat exchanger which come into contact with the gas have been hot dip galvanized and the surfaces which come into contact with the gas, after the hot dip galvanization, have been heat treated at a temperature in the range from 400 to 750° C. The invention further relates to the use of the heat exchanger.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of drying superabsorbent particles comprising heating a drying gas to a temperature in a range from 150 to 400° C. by indirect heat transfer in a heat exchanger for heating gas to a temperature in the range from 150 to 400° C. by indirect heat transfer, wherein all surfaces of walls of the heat exchanger which contact a gas have been hot dip galvanized and then cooled under air to form a zinc-iron diffusion layer and a pure zinc layer on the walls, wherein after the hot dip galvanization and cooling under air, surfaces which contact the gas have been heat treated at a temperature in the range from 400 to 750° C., thereby achieving a zinc coating that remains stable and wherein no Kirkendall effect occurs. 2. The method according to claim 1 , wherein the heat exchanger is disposed beneath a drying belt of a belt drier. 3. The method according to claim 1 for drying superabsorbent particles. 4. The method according to claim 1 , wherein the heat exchanger heats the drying gas which is added to a spray tower for production of superabsorbent particles. 5. The method according to claim 1 , wherein the drying gas is circulated. 6. The method according to claim 1 , wherein a thermal oil, an ionic liquid, a salt melt, or steam is used as a heat transfer medium.
Assignees
Inventors
Classifications
Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure · CPC title
- F28F19/06Primary
of metal · CPC title
Zinc or cadmium or alloys based thereon · CPC title
Thermal after-treatment, e.g. treatment in oil bath · CPC title
the gas or vapour circulating over or surrounding the materials or objects to be dried (F26B3/14 takes precedence) · CPC title
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- What does patent US11933552B2 cover?
- The invention relates to a heat exchanger for heating gas to a temperature in the range from 150 to 400° C., wherein the gas is heated by indirect heat transfer and all the surfaces of the walls of the heat exchanger which come into contact with the gas have been hot dip galvanized and the surfaces which come into contact with the gas, after the hot dip galvanization, have been heat treated at …
- Who is the assignee on this patent?
- Basf Se
- What technology area does this patent fall under?
- Primary CPC classification F28F19/06. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Mar 19 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).